css opacity animation

1/* Answer to: "css transition opacity" */
2
3/*
4  CSS transitions allows you to change property values smoothly,
5  over a given duration.
6*/
7
8.myClass {
9  vertical-align: top;
10  transition: opacity 0.3s; /* Transition should take 0.3s */
11  -webkit-transition: opacity 0.3s; /* Transition should take 0.3s */
12  opacity: 1; /* Set opacity to 1 */
13}
14
15.myClass:hover {
16  opacity: 0.5; /* On hover, set opacity to 2 */
17}
18
19/* 
20  From `opacity: 1;` to `opacity: 0.5;`, the transition time should
21  take 0.3 seconds as soon as the client starts to hover over the
22  element.
23*/

1<style>
2.myelement{
3  animation: fade-out;
4}
5
6@keyframes fade-out{
7  0%{
8    opacity: 1.0
9  }
10  100{
11    opacity: 0.0
12  }
13}
14</style>

1<style>
2	.element-class {
3		opacity: 0.5;
4      	transition: opacity 0.5s ease-in-out;
5	}
6</style>

1.div{
2  opacity: 0.8; /* 1 means fully visible, 0 means invisible */
3}